/**
 * Copyright 2021 xpstem.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.xpstem.lelink.operation;

import com.xpstem.lelink.type.EV3Type;

import java.io.IOException;
import java.io.InputStream;

/**
 * EV3 operation return parameter.
 * @author billy zhang
 */
public class ReturnParam<T extends EV3Type> {

    private int index;
    private T value;
    private T[] values;

    public ReturnParam(int index, T value) {
        this(index, value, null);
    }

    public ReturnParam(int index, T value, T[] values) {
        this.index = index;
        this.value = value;
        this.values = values;
    }

    public int getIndex() {
        return index;
    }

    public int getSize() {
        return values != null ? value.size() * values.length
                : value.size();
    }

    public T getValue() {
        return value;
    }

    public T[] getValues() { return values; }

    public void parse(InputStream inStream, int index) throws IOException {
        if (values != null) {
            inStream.skip(index);
            for (int i=0; i<values.length; i++) {
                values[i] = (T)value.copy();
                values[i].readFrom(inStream, 0);
            }
        } else {
            value.readFrom(inStream, index);
        }
    }
}
